Question: Post machine that accepts all words that have an a as a middle letter 13. (i) Build a PM that accepts the language of all

Post machine that accepts all words that have an a as a middle letter Post machine that accepts all words that have an a as

13. (i) Build a PM that accepts the language of all words that have an a as the middle letter: (These words obviously must have odd length). (ii) Prove that this language is nonregular. (iii) Prove that this language is context-free

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